Shield for glass hypodermic syringes



Dec. 22,

L. EISELE SHIELD FOR GLASS HYPODERMIC SYRINGES Filed May 14, 1921 Patented Dec. 22, 1925.

UNITED LOGAN EISELE, OF NASHVILLE, TENNESSEE.

SHIELD FOR GLASS HYPODERMIC SYRINGES.

Application filed May 14, 1921.

To all whom, it may concern:

Be it. known that I, LOGAN Ersnnn, a citizen of the United States, and a resident of Nashville, in the county of Davidson, State of Tennessee. have invented certain new and useful Improvements in Shields for Glass Hypodermic Syringes, of which the following is a specification.

This invention relates to hypodermic syringes having more par icular reference to a shield 0r guard for hypodermic syringes con structed with glass body and glass tips. In syringes of this type, the glass body commonly constructed with a projecting tip on which the needle holder mounted, and in the ordinary construction of the syringe and mounting of the needle holder, this project ing tip is extremely liable to fracture, either during use of the syringe, or by accidentally knocking the needle holder against some other object or when it is attempt d to remove the needle holder'for cleaning or other purposes.

It is the general object of the present in vention to so construct and mount the needle holder as to provide a shield or guard for the projecting tip on the glass body, whereby liability of said tip to breakage will be obviated.

Another object is to provide a construction in which a shield or a guard for all or part of the glass barrel or cylinder proper is providecl. v as well as a ard for the tip.

Still another object is to construct av shield or guard for the glass cylinder and glass tip in such a manner that the contents of the syringe will come in contact with glass only, thus retaining all of the non-corrodible fea tures of the glass syringes as they are now made, while remedying their disadvantage of fragility.

For further comprehension of the invention and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings in which the various novel features of the invention are more particularly set forth.

Figure (1) of the drawings is a side View of the hypodermic syringe.

Fig. 2 is a view taken at right angles to Fig. 1. partly in section and Fig. 3 is a bottom plan view.

As shown in the drawings, the reference letter B indicates a metal shield which encases a glass body or cylinder in which the usual piston (not shown) is provided. The

Serial No. 469,679.

metal shield comprises a rearward cylindrical extension which encases the glass cylinder and a diminished forward extension T upon which is adapted to be secured the usual hypodermic needle base. The forward extension T is provided with a tapered boring in which is adapted to be received the forwardly projectingtapered tip T of the glass body or cylinder B. The boring of the metal shield is a trifle larger than the lass tip T and the glass tip is secured with in the metal tip by solder or cement. It will be noted that the tip and metal extension are exactly of the same length so that therefore there will be no contact of the contents of the syringe with the metal parts thereof. The use of solder or cement not only prevents any of the contents from passing bzrcl between the tip and metal eittens n wllffll the syringe is actuated but aiso of importance in the assembling of the parts. I have found that it is very dif icult to secure perfect alignment of the tip at the con r of the glass body which cons H .ieatiy increases the manufacturi g costs. b making the boring of the metal extension a trifle larger than the tip it is therefore not neces. ry to secure absolute precision in the centering of the glass tip, the solder or cement compensating for any inequalities.

As will be apparent from the above description, a shield or guard for the project ing tip of the glass syringe bed is pro vided whereby danger of lll'Ptlh of the tip is obviated.

Having thus described my invention, what I claim as new and desire to protect by Le "ters Patent of the United States is as follows:

A hypodermic syringe comprising a glass body, a metal shield covering said glass body and having a rearward cylindrical 6X- tension projecting over the said glass body and a diminished forward extension adapted to support a needle base, said forward extension being provided with a boring, and said glass body having a forwardly projecting tip coextensive with said forward extension, and means between said glass tip .and said forward extension for permanently securing said shield to said glass body for preventing the contents of said syringe from being forced backward between said tip and said forward extension.

LOGAN EISELE. 

